Valve.



F. L. SMITH.

VALVE.

APPLICATION FILED JULY 18, 1904.

PATENTED MAY. 29, 1906.

UNITED STATES FRANK L. SMITH, OF CHICAGO, ILLINOIS, ASSIGNOR CF TWC-THIBDS TC ALVA C. RICKSECKER AND ONE-THIRD TO LEWIS A. NICHOLS,

OF CHICAGO, ILLINOIS.

VALVE.

Specification of Letters Patent.

'ratented May 29, 1806.

Application filed July 18 .1904.- Serial No. 216,935.

To all whom it'may concern:

Be it known that I, FRANK L. SMITH, a citizen of the United States, residing at No. 215 East Sixty-fifth place, Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Valves, of which, the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

The purpose of this invention is to provide an improved form of valve having a removable and-interchangeable disk to afford its seating-face, and particularly an improved form of disk for such purpose.

It consists in'the features of construction set out in the claims.

In the drawing the figure is an axial section of a valve embodying my invention,' showing it in its seat, which is also in section.

The valve is shown with the conventional form of threaded stem 1, whose thread, it

will be understood, is adapted to engage the casing of the valve for rotation in seating an unseating. Such stem is made rigid with the head 2, such rigidity being feasible in view of the form of the seating-disk 3, which is an annular concavo-convex disk, which may be termed spherical in form, such spherical form adapting it to seat perfectly on its tapered seat 4 in the valve-body (of which only the diaphragm containing the aperture and such tapered seat therein is shown) notwithstanding the plane of the diaphragm containing such seat may not be strictly at right angles to the axis of the valve-stein. The concavo-convex annular seating-disk 3 is preferably made of relatively soft metal such as copper, for exampleso that it may not'tend to cut or wear the tapered seat 4, the wear being limited substantially to the valve-disk 3. This con struction has the further advantage equally important with that first named that the soft-metal disk accommodating itself to its seat in case of inaccurate adjustment in construction will not merely spring, which would tend to cause a buckling or curving inward at one part to compensate a curving outward at another part, but will yield without materially springing and will come to its seat at all parts of the circumference. The necpression on essary resistance for the work required of the valve under high pressures is afforded by the arch construction involved in the spherical annular form of the disk, and further reinforcement is obtained when necessary by the,

relation of that form to the head 2, upon which itis mounted, which may be con structed as shown in the drawings-to wit, curved somewhat similarly to the disk, but with its curvature such that the surface of the head facing the inner concave surface of the disk diverges from the said concave inner surface of the disk from a point near the back or upper edge of the disk toward the center, leaving a cavity which in radial section is somewhat crescent-shaped; This interval,

somewhat exaggerated in the drawing, is designed to correspond to the limit to which the disk may yield under pressure without being ruptured or crimpedthat is, taking into consideration its elasticity as well as its softness or flexibility and adaptation to yield to compression, so that while the disk may accommodate itself to the necessities arising from inaccurate original adaptation to its seat to the full extent consistent with the integrity of the disk it shall be reinforced by the head froin that limit and saved from any destructive strain. It will be noticed that this annular spherical seatingdisk is centered by its inner surface at the upper or rear periphery, fitting on the circular head, whose outer diameter at that point corresponds to the inner diameter of the disk. The disk is also stopped at by the annular flange 5 around the corre spouding edge of the head, so that the com the seat may operate described to produce an accommodation of the disk to the seat and shall not merely force the disk back on the head, The direction of pressure in forcing the valve to its seat is such as does not ordinarily tend to spread the disk at its lodgment at the rear edge on the flange 5; but for security in this respect it may be desirable in some cases to make this flange with its lower or forward surface at a slightly acute angle to the curved surface of the head, so that a slightly beveled or sharp ened rear edge of the disk 3 will fit it with a tendency to thrust inward under pressure and defeat any tendency of the disk to spread and so become dislodged from the flange.

The most convenient manner of securing and binding the disk 3 to the valve-head is that shown, wherein the head has a central threaded spud 6, which receives the clamp- I ing-nut 7.

constructionshown in'this application is also shown in another specific form in my Patent No. 749,637, dated January 12, 1904, for the reissue of which my application, Serial No. 217,275, filed July 19, 1904, is now pending, in which'said a plication said generic invention is claimed broadly.

I claim- 1. A valve comprising a head and a removable metal concave-convex annular disk lodged on the head and sup orted thereon at the outer circumference Wit the convex surface outward and constituting the seating face of the valve, the head being formed to protrude into the concavity of said disk back of said outer seating-face for centering the disk on the head.

2. A valve comprising a head and a removable metal concavo-convex annular disk approximately a spherical segment in form, t

e head being formed to protrude into the .annular cavity of the disk and proximate the inner surface thereof back of .or opposite the seatin -face,'and means for securing the disk to the ead.

3. A valve com rising a head and a removable metal disi: havingan annular concavo-convex portion whose convex surface .constitutes the seating-face of the valve, the

valve-head being formed to approximately coincide with the concave inner surface of i said disk 0p osite its said seating-face and to diverge slig tly from the rear inner circumference-for centering the disk on the head,

the head having a marginal flange for positivelysu porting the disk, and means for binding t e disk to the head.

4. A valve comprising a head and a removable metal disk having a concave-convex annular portion whose outer surface constitutes the seating-face of the valve, the head being formed to protrude into the cavity of such concave-convex portion to reinforce the disk and having a marginal flange for affording positive lodgment and support for the rear edge of the disk, the forward surface of said flange making an acute angle to the axis of the valve. I

5, A valve comprising a head and a removable metal disk having a concave-convex annular portion and a portion encompassed by such annular portion, said disk being supported at its outer circumference on the head and centered thereon with the convex face of the annulus outward and constitutin the seating-face of the valve; means'for 0 amping said encompassed portion of the disk to the head and a gasket inter osed between the head and the disk at said c amped portion.

6. A valve comprising a head havin a threaded p'ost projecting from its face, a isk having a central aperture to receive said post, and having a valve-face, and having its outer edge seated'on the faceof the head, a gasket surrounding'the post between the disk and heziii, and a nut on said post exterior of the dis 7. A valve comprising a head havin a threaded post projecting from its face, a isk having its outer edge seated on the face .of the head, and having a central aperture to re ceive said post, and having an annular concavo-convex. forming the valve-face, a nut on said post exterior of the disk, and means surrounding the post and adapted to prevent the passage of fluid through the aperture in the disk.

In testimony whereof I have hereunto set my hand, in the presence of two witnesses, at

Chicago, Illinois, this 11th day of July, 1904. FRANK L. SMITH. j In presence of- (has. S'Bumon, FRED. G. FISCHER. 

